he educates families about the risk of playing football. >> football is a game. if i could talk to every kid putting on their helmet, "this is a game. this is life. this is life. this is what i experience because i stepped away from football." >> sure. >> imagine if i didn't - why would i sacrifices my life for a game. >> i don't think there's going be a concussion helmet. you can think of this like a car crash. if you were the brain and the car is your skull. doesn't matter if the car is indesinstructible you, the brain, will still fly forward and hit the windshield. that's the concussion - the brain hitting the skull. we have to think of this differently. >> it can be applied to soldiers, i am sure a lot of them get hits as well. >> the labs i went to were working with darpa, the department of defense, because when you undergo a grenade blast or something like that there's a shock wave that moves your brain like an nfl hit would. >> you went upstate new york and covered a story that was different. what was it. >> i went and met two fun guys. two former students